426 LXVIT. UMBELLIFERyE. [Sium 



opposite sessile membranous patent leaflets ranging up to 2| in. 

 long by 4 in. broad ; stem-leaves similar, with common petiole 

 fistular rather short dilated and sheathing, and leaflets linear or 

 nearly so, obtuse subacute or more or less apiculate, denticulate 

 or repand, rather rigid, ranging up to 3| in. long by | in. broad, 

 erect-patent, sessile ; teeth cartilaginous on the margin, sometimes 

 quite acute, in other cases rather obtuse, mostly adpressed and 

 thus making the margin of the leaflet look crenulate ; the 

 cartilaginous margin turning a pretty red in the living state, but 

 at length turning pale in the dry state, always tumid ; umbels 

 axillary and terminal, 1| to 2 in. in diameter; peduncle | to 2^ 

 in. long, f uiTOwed ; leaves of the involucre numerous, linear, 

 entire, i to 4 in. long ; rays of the umbel numerous ranging up 

 to nearly an inch ; leaves of the involucels several, danceolate, 

 nearly equalling the short rays of the involucre ; flowers from 

 greenish to yellowish ; young fruit purplish or somewhat brown. 



Bumbo. — At the banks of streams in the primitive forest near 

 Bumbo, in company with Ranunculus pinnatus Poir. (Welw. Herb. 

 No. 1209) and a species of Salix ; Oct. 1859. A young plant, with 

 foliage only and without inflorescence, apparently this species. No. 2510. 



HuiLLA. — At the banks of streams and in flooded places in the valley 

 of LopoUo, from Humpata towards Jau, abundant ; fl. and young fr. 

 Jan. 1860. No. 2511. 



Apparently nearly related to the last species, but the fruits seen are 

 too young to enable its affinity to be definitely assigned. 



7. PIMPINELLA Riv., L. ; Benth. & Hook. f. Gen. PI. i. p. 893. 



1. P. huillensis Welw. ex Engl. Hochgebirgsfl. p. 319 "(1892). 

 HuiLLA. — Stems quite glabrous ; fruits densely muriculate. In 



rocky pastures among short bushes near Humpata, in company with 

 FraiicheteUa arborrscetis O. Kuntze, var. stenopliyUa (Welw. Herb. 

 No. 2508) ; fl. and fr. 23 April 1860. No. 2502. Slender, perennial, 

 tuberous ; radical leaves rosulate, oblong ; fr. May 1860. Coll. 

 Carp. 626. 



Var. elatior Welw. ms. in Herb. 



P. Welwitschii Engl., I.e. 



A taller plant than the type ; stem-leaves occasionally trif oliolate. 



HuiLLA. — Flowers white. In rather open, sandy forests composed 

 ©f Panda-trees, between Eme and the lake of Ivantala ; fl. Jan. and 

 end of Feb. 1860. Nos. 2503 and 2503&. 



2. P. platjrpliylla Welw. ms. in Herb. 



An erect perennial remarkably aromatic herb ; root thick, 

 fusiform, ^vith a very strong rank odour ; stem terete, firm, 

 subglabrous, finely sulcate-striate, pithy, usually branched in the 

 upper part, about 3 to 5 ft. high ; radical leaves reniform or 

 orbicular-cordiform, glaucous, rigidly coriaceous, more or less 

 rosulate, simple, dilated towards the apex, very obtuse, 2 to 5 in. 

 in diameter or more, broadly and sharply denticulate or repand on 

 the margin, puberulous, petiolate, quickly breaking up after the 

 spring rains ; stem-leaves oval, deeply cordate at the base, smaller ; 



